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cdef extern from "math.h":
double c_lgamma "lgamma" (double)
double c_exp "exp" (double)
def exp(n):
"""Return e**n."""
return c_exp(n)
def lfactorial(n):
"""Return an estimate of the log factorial of n."""
return c_lgamma(n+1)
def factorial(n):
"""Return an estimate of the factorial of n."""
return c_exp( c_lgamma(n+1) )
if __name__ == "__main__":
import sys
if len(sys.argv) != 2:
sys.stderr.write("USAGE: %s n\nPrints n!.\n" % sys.argv[0])
sys.exit(2)
n, = map(float, sys.argv[1:])
print factorial(n)